/* Modern Blackboard Converter Styles */

:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --success-color: #04AA6D;
    --success-hover: #038a5a;
    --background: #f0f2f5;
    --surface: #ffffff;
    --text-primary: #333;
    --text-secondary: #666;
    --border-color: #ddd;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

/* SEU Color Scheme - Light Theme */
:root {
    --seu-primary: #1e3a8a;
    --seu-primary-dark: #1e40af;
    --seu-secondary: #0ea5e9;
    --seu-accent: #f59e0b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.15);
}

/* Dark Theme */
.dark-theme {
    --seu-primary: #3b82f6;
    --seu-primary-dark: #2563eb;
    --seu-secondary: #60a5fa;
    --seu-accent: #fbbf24;
    --bg-primary: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header Styles - Matching BB Banner Maker */
.header {
    background: linear-gradient(135deg, var(--seu-primary) 0%, var(--seu-primary-dark) 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    flex-direction: column;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
    color: white;
}

.logo-subtitle {
    font-size: 0.85rem;
    font-weight: 400;
    margin: 0.25rem 0 0 0;
    opacity: 0.9;
    letter-spacing: 0.5px;
    color: white;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.btn-icon {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: background-color 0.3s ease;
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.3);
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem;
    border-radius: 8px;
}

.lang-btn {
    background: transparent;
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

.lang-btn.active {
    background: white;
    color: var(--seu-primary);
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

[dir="rtl"] .header-content {
    flex-direction: row-reverse;
    direction: rtl;
}

[dir="rtl"] .logo-section {
    text-align: right;
    align-items: flex-end;
    order: 2;
}

[dir="rtl"] .header-controls {
    order: 1;
}

[dir="rtl"] .sidebar-nav ul li a {
    text-align: right;
}

[dir="rtl"] .main-content .container {
    flex-direction: row-reverse;
}

[dir="rtl"] .language-switcher {
    flex-direction: row-reverse;
}

/* Ensure sidebar is on the right in RTL mode */
[dir="rtl"] .sidebar-nav {
    order: 2;
}

[dir="rtl"] .content-area {
    order: 1;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem 0;
    background-color: var(--bg-secondary);
    display: flex;
    min-height: 0;
}

.main-content .container {
    background-color: var(--bg-primary);
    padding: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    max-width: 1400px;
    width: 100%;
    animation: fadeIn 0.5s ease-in;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 20px;
    min-height: 0;
}

/* Left Sidebar Navigation */
.sidebar-nav {
    flex-shrink: 0;
    width: 200px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 15px;
    height: fit-content;
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: transparent;
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
}

.sidebar-nav ul li {
    flex-shrink: 0;
}

.sidebar-nav ul li a {
    display: block;
    padding: 12px 16px;
    border-radius: 8px;
    text-align: left;
    white-space: normal;
    min-width: auto;
    border-bottom: none;
    background: transparent;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.sidebar-nav ul li a:hover:not(.active) {
    background: rgba(30, 58, 138, 0.1);
    border-bottom: none;
}

.sidebar-nav ul li a.active {
    background: linear-gradient(135deg, var(--seu-primary) 0%, var(--seu-primary-dark) 100%);
    color: white;
    border-bottom: none;
}

.content-area {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

/* Hide top nav when sidebar is used */
.content-area nav {
    display: none;
}

/* Tab Content Headings */
.tabcontent h2 {
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 1.3em;
    font-weight: 600;
}

.tabcontent h3 {
    margin-top: 0;
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: 600;
}

/* Help Text Styles */
.help-text {
    color: var(--text-secondary);
    font-size: 0.85em;
    margin: 8px 0;
    font-style: italic;
    line-height: 1.4;
}

.help-text-small {
    color: var(--text-secondary);
    font-size: 0.85em;
    margin: 5px 0 0 0;
    font-style: italic;
}

.example-text {
    background-color: var(--bg-tertiary);
    border-left: 4px solid var(--seu-primary);
    padding: 10px 15px;
    margin: 10px 0;
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
    color: var(--text-primary);
    border-radius: 4px;
    white-space: pre-line;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease, margin 0.3s ease;
}

.example-text.expanded {
    max-height: 500px;
    padding: 10px 15px;
    margin: 10px 0;
}

.example-toggle {
    background: none;
    border: none;
    color: var(--seu-primary);
    cursor: pointer;
    padding: 5px 10px;
    font-size: 0.85em;
    text-decoration: underline;
    margin: 5px 0;
    display: inline-block;
    transition: color 0.3s ease;
}

.example-toggle:hover {
    color: var(--seu-primary-dark);
    background-color: transparent;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Navigation Bar - Improved Tab Design */
nav {
    margin-bottom: 25px;
}

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    overflow-y: hidden;
    background: linear-gradient(135deg, var(--seu-primary) 0%, var(--seu-primary-dark) 100%);
    display: flex;
    justify-content: flex-start;
    border-radius: 12px 12px 0 0;
    box-shadow: var(--shadow-md);
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
}

ul::-webkit-scrollbar {
    height: 6px;
}

ul::-webkit-scrollbar-track {
    background: transparent;
}

ul::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

ul::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}

ul li {
    flex-shrink: 0;
}

ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 18px;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    min-width: fit-content;
}

ul li a:hover:not(.active) {
    background-color: rgba(255, 255, 255, 0.1);
    border-bottom-color: rgba(255, 255, 255, 0.3);
}

ul li a.active {
    background-color: rgba(255, 255, 255, 0.15);
    border-bottom-color: var(--success-color);
    font-weight: 600;
}

ul li a:focus {
    outline: 2px solid rgba(255, 255, 255, 0.5);
    outline-offset: -2px;
}

/* Tab Content */
.tabcontent {
    display: none;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 12px 12px;
    background: var(--bg-primary);
    animation: slideIn 0.3s ease-out;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.tabcontent h3 {
    margin-top: 0;
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: 600;
}

/* Textarea - Consolidated and Modern */
textarea {
    width: 100%;
    min-height: 180px;
    max-height: 300px;
    padding: 12px;
    font-size: 15px;
    font-family: 'Courier New', monospace;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    transition: var(--transition);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    line-height: 1.5;
}

textarea:focus {
    outline: none;
    border-color: var(--seu-primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
    background-color: var(--bg-primary);
}

.dark-theme textarea:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

#outputText {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    font-family: 'Courier New', monospace;
    min-height: 120px;
    max-height: 200px;
    color: var(--text-primary);
}

#outputText:empty::before {
    content: "Converted questions will appear here...";
    color: var(--text-secondary);
    font-style: italic;
}

/* Button Container - Consolidated */
.button-container {
    margin: 15px 0;
    text-align: center;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons - Modern Design */
button {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--seu-primary) 0%, var(--seu-primary-dark) 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:hover::before {
    width: 300px;
    height: 300px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--seu-primary-dark) 0%, var(--seu-primary) 100%);
}

button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

button:focus {
    outline: 2px solid var(--seu-primary);
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

button.secondary {
    background: linear-gradient(135deg, #64748b 0%, #475569 100%);
}

button.secondary:hover {
    background: linear-gradient(135deg, #475569 0%, #64748b 100%);
}

button.success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

button.success:hover {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
}

/* Information Notice (Combined Tip & Privacy) */
.info-notice {
    margin: 15px 0;
    padding: 12px 15px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.info-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.info-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.info-section {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-section strong {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95em;
}

.info-section p {
    margin: 0;
    color: var(--text-secondary);
}

/* Question Counter */
p strong {
    color: var(--text-primary);
    font-size: 1.1em;
}

p strong span {
    color: var(--seu-primary);
    font-weight: 700;
    font-size: 1.2em;
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
    max-width: 400px;
    font-weight: 500;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.notification.success {
    background-color: var(--success-color);
    color: white;
}

.notification.error {
    background-color: #dc3545;
    color: white;
}

.notification.info {
    background-color: var(--seu-primary);
    color: white;
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Footer Styles - Matching BB Banner Maker */
.footer {
    background: var(--bg-primary);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer p {
    margin: 0;
    font-size: 0.9rem;
}

.footer-developer {
    margin-top: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.footer-developer p {
    margin: 0;
    font-size: 0.9rem;
}

.developer-links {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.social-link {
    color: var(--text-secondary);
    transition: color 0.3s ease, transform 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.social-link:hover {
    color: var(--seu-primary);
    transform: translateY(-2px);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    .main-content .container {
        flex-direction: column;
    }

    .sidebar-nav {
        width: 100%;
        position: static;
        max-height: none;
        margin-bottom: 20px;
    }

    .sidebar-nav ul {
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
    }

    .sidebar-nav ul li a {
        white-space: nowrap;
    }

    .content-area nav {
        display: block;
    }
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .main-content {
        padding: 1rem 0;
    }

    .main-content .container {
        padding: 15px;
        border-radius: 12px;
    }

    .header {
        padding: 1rem 0;
    }

    .logo {
        font-size: 1.4rem;
    }

    .logo-subtitle {
        font-size: 0.75rem;
    }

    ul {
        border-radius: 12px;
        overflow-x: auto;
    }

    ul li a {
        padding: 12px 16px;
        font-size: 0.9rem;
    }

    .tabcontent {
        padding: 15px;
        border-radius: 0 0 12px 12px;
    }

    textarea {
        min-height: 150px;
        font-size: 14px;
    }

    .button-container {
        flex-direction: column;
    }

    button {
        width: 100%;
    }

    .notification {
        right: 10px;
        left: 10px;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }

    textarea {
        min-height: 120px;
        font-size: 14px;
        padding: 10px;
    }

    .tabcontent {
        padding: 12px;
    }

    .tabcontent h3 {
        font-size: 1.2em;
    }
}

/* Accessibility - Focus Indicators */
*:focus-visible {
    outline: 2px solid var(--seu-primary);
    outline-offset: 2px;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}